From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 226A3C4338F for ; Thu, 19 Aug 2021 02:21:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 015FC60FE8 for ; Thu, 19 Aug 2021 02:21:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235558AbhHSCWS (ORCPT ); Wed, 18 Aug 2021 22:22:18 -0400 Received: from szxga01-in.huawei.com ([45.249.212.187]:17042 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235384AbhHSCWS (ORCPT ); Wed, 18 Aug 2021 22:22:18 -0400 Received: from dggemv703-chm.china.huawei.com (unknown [172.30.72.53]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4GqpMS18FNzbfKr; Thu, 19 Aug 2021 10:17:56 +0800 (CST) Received: from dggpeml500017.china.huawei.com (7.185.36.243) by dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Thu, 19 Aug 2021 10:21:41 +0800 Received: from localhost.localdomain (10.67.165.24) by dggpeml500017.china.huawei.com (7.185.36.243) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Thu, 19 Aug 2021 10:21:40 +0800 From: Wenpeng Liang To: , CC: , , Subject: [RESEND PATCH v2 for-next] RDMA/hns: Solve the problem that dma_pool is used during the reset Date: Thu, 19 Aug 2021 10:17:54 +0800 Message-ID: <1629339474-43445-1-git-send-email-liangwenpeng@huawei.com> X-Mailer: git-send-email 2.8.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.165.24] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpeml500017.china.huawei.com (7.185.36.243) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Lang Cheng During the reset, the driver calls dma_pool_destroy() to release the dma_pool resources. If the dma_pool_free interface is called during the modify_qp operation, an exception will occur. [15834.440744] Unable to handle kernel paging request at virtual address ffffa2cfc7725678 ... [15834.660596] Call trace: [15834.663033] queued_spin_lock_slowpath+0x224/0x308 [15834.667802] _raw_spin_lock_irqsave+0x78/0x88 [15834.672140] dma_pool_free+0x34/0x118 [15834.675799] hns_roce_free_cmd_mailbox+0x54/0x88 [hns_roce_hw_v2] [15834.681872] hns_roce_v2_qp_modify.isra.57+0xcc/0x120 [hns_roce_hw_v2] [15834.688376] hns_roce_v2_modify_qp+0x4d4/0x1ef8 [hns_roce_hw_v2] [15834.694362] hns_roce_modify_qp+0x214/0x5a8 [hns_roce_hw_v2] [15834.699996] _ib_modify_qp+0xf0/0x308 [15834.703642] ib_modify_qp+0x38/0x48 [15834.707118] rt_ktest_modify_qp+0x14c/0x998 [rdma_test] ... [15837.269216] Unable to handle kernel paging request at virtual address 000197c995a1d1b4 ... [15837.480898] Call trace: [15837.483335] __free_pages+0x28/0x78 [15837.486807] dma_direct_free_pages+0xa0/0xe8 [15837.491058] dma_direct_free+0x48/0x60 [15837.494790] dma_free_attrs+0xa4/0xe8 [15837.498449] hns_roce_buf_free+0xb0/0x150 [hns_roce_hw_v2] [15837.503918] mtr_free_bufs.isra.1+0x88/0xc0 [hns_roce_hw_v2] [15837.509558] hns_roce_mtr_destroy+0x60/0x80 [hns_roce_hw_v2] [15837.515198] hns_roce_v2_cleanup_eq_table+0x1d0/0x2a0 [hns_roce_hw_v2] [15837.521701] hns_roce_exit+0x108/0x1e0 [hns_roce_hw_v2] [15837.526908] __hns_roce_hw_v2_uninit_instance.isra.75+0x70/0xb8 [hns_roce_hw_v2] [15837.534276] hns_roce_hw_v2_uninit_instance+0x64/0x80 [hns_roce_hw_v2] [15837.540786] hclge_uninit_client_instance+0xe8/0x1e8 [hclge] [15837.546419] hnae3_uninit_client_instance+0xc4/0x118 [hnae3] [15837.552052] hnae3_unregister_client+0x16c/0x1f0 [hnae3] [15837.557346] hns_roce_hw_v2_exit+0x34/0x50 [hns_roce_hw_v2] [15837.562895] __arm64_sys_delete_module+0x208/0x268 [15837.567665] el0_svc_common.constprop.4+0x110/0x200 [15837.572520] do_el0_svc+0x34/0x98 [15837.575821] el0_svc+0x14/0x40 [15837.578862] el0_sync_handler+0xb0/0x2d0 [15837.582766] el0_sync+0x140/0x180 It is caused by two concurrent processes: uninit_instance->dma_pool_destroy(cmdq) modify_qp->dma_poll_free(cmdq) Fixes: 9a4435375cd1 ("IB/hns: Add driver files for hns RoCE driver") Signed-off-by: Lang Cheng Signed-off-by: Jiaran Zhang Signed-off-by: Wenpeng Liang --- drivers/infiniband/hw/hns/hns_roce_cmd.c | 12 ++++++++++++ drivers/infiniband/hw/hns/hns_roce_device.h | 1 + 2 files changed, 13 insertions(+) diff --git a/drivers/infiniband/hw/hns/hns_roce_cmd.c b/drivers/infiniband/hw/hns/hns_roce_cmd.c index 8f68cc3..3dfb97a 100644 --- a/drivers/infiniband/hw/hns/hns_roce_cmd.c +++ b/drivers/infiniband/hw/hns/hns_roce_cmd.c @@ -198,12 +198,16 @@ int hns_roce_cmd_init(struct hns_roce_dev *hr_dev) if (!hr_dev->cmd.pool) return -ENOMEM; + init_rwsem(&hr_dev->cmd.mb_rwsem); + return 0; } void hns_roce_cmd_cleanup(struct hns_roce_dev *hr_dev) { + down_write(&hr_dev->cmd.mb_rwsem); dma_pool_destroy(hr_dev->cmd.pool); + up_write(&hr_dev->cmd.mb_rwsem); } int hns_roce_cmd_use_events(struct hns_roce_dev *hr_dev) @@ -237,8 +241,10 @@ void hns_roce_cmd_use_polling(struct hns_roce_dev *hr_dev) { struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd; + down_write(&hr_dev->cmd.mb_rwsem); kfree(hr_cmd->context); hr_cmd->use_events = 0; + up_write(&hr_dev->cmd.mb_rwsem); up(&hr_cmd->poll_sem); } @@ -252,9 +258,12 @@ hns_roce_alloc_cmd_mailbox(struct hns_roce_dev *hr_dev) if (!mailbox) return ERR_PTR(-ENOMEM); + down_read(&hr_dev->cmd.mb_rwsem); mailbox->buf = dma_pool_alloc(hr_dev->cmd.pool, GFP_KERNEL, &mailbox->dma); if (!mailbox->buf) { + up_read(&hr_dev->cmd.mb_rwsem); + kfree(mailbox); return ERR_PTR(-ENOMEM); } @@ -269,5 +278,8 @@ void hns_roce_free_cmd_mailbox(struct hns_roce_dev *hr_dev, return; dma_pool_free(hr_dev->cmd.pool, mailbox->buf, mailbox->dma); + + up_read(&hr_dev->cmd.mb_rwsem); + kfree(mailbox); } diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h index 0c3eb11..90d8ef8 100644 --- a/drivers/infiniband/hw/hns/hns_roce_device.h +++ b/drivers/infiniband/hw/hns/hns_roce_device.h @@ -571,6 +571,7 @@ struct hns_roce_cmdq { * close device, switch into poll mode(non event mode) */ u8 use_events; + struct rw_semaphore mb_rwsem; }; struct hns_roce_cmd_mailbox { -- 2.8.1